| 3 | x | + | 4 | ( | 1 | − | x | ) | = | 28 25 | ( | 3 | x | + | 2 | ( | 1 | − | x | ) | ) |
| 方程左边 = | 3 | x | + | 4 | × | 1 | − | 4 | x |
| = | 3 | x | + | 4 | − | 4 | x |
| = | - | 1 | x | + | 4 |
| - | 1 | x | + | 4 | = | 28 25 | ( | 3 | x | + | 2 | ( | 1 | − | x | ) | ) |
| 方程右边 = | 28 25 | × | 3 | x | + | 28 25 | × | 2 | ( | 1 | − | x | ) |
| = | 84 25 | x | + | 56 25 | ( | 1 | − | x | ) |
| = | 84 25 | x | + | 56 25 | × | 1 | − | 56 25 | x |
| = | 84 25 | x | + | 56 25 | − | 56 25 | x |
| = | 28 25 | x | + | 56 25 |
| - | 1 | x | + | 4 | = | 28 25 | x | + | 56 25 |
| - | 1 | x | − | 28 25 | x | = | 56 25 | − | 4 |
| - | 53 25 | x | = | 56 25 | − | 4 |
| - | 53 25 | x | = | - | 44 25 |
44 25 | = | 53 25 | x |
53 25 | x | = | 44 25 |
| x | = | 44 25 | ÷ | 53 25 |
| = | 44 25 | × | 25 53 |
| = | 44 | × | 1 53 |
| x | = | 44 53 |
| x | = | 0.830189 |